SF: Adding sysprop flag for video detection

The flag will be turned on in a new CL.

Test: manual
Bug: 126272046

Change-Id: Ie15c0abbde641a731616cf94b076e43feafe7bc7
diff --git a/services/surfaceflinger/SurfaceFlingerProperties.cpp b/services/surfaceflinger/SurfaceFlingerProperties.cpp
index 875fca8..e130511 100644
--- a/services/surfaceflinger/SurfaceFlingerProperties.cpp
+++ b/services/surfaceflinger/SurfaceFlingerProperties.cpp
@@ -217,6 +217,14 @@
     return defaultValue;
 }
 
+bool use_smart_90_for_video(bool defaultValue) {
+    auto temp = SurfaceFlingerProperties::use_smart_90_for_video();
+    if (temp.has_value()) {
+        return *temp;
+    }
+    return defaultValue;
+}
+
 #define DISPLAY_PRIMARY_SIZE 3
 
 constexpr float kSrgbRedX = 0.4123f;